There are threads in the Diablo III Forums about players exploiting the way vote kick mechanics work in Blizzard's action/RPG sequel to get other players killed, which is a particular problem in Hardcore, where character death is permanent. A post by Blizzard responds to this situation saying this unintended form of PvP griefiing will be addressed ASAP:

Ehhh. While the advice "don't play in Hardcore public games" may be valid in a number of situations, we recognize that this is a legitimate issue for Hardcore players and want to address it ASAP -- ideally in a way that doesn't impact co-op play (or impacts it as minimally as possible).

Right now, we're looking to remove the 10-second movement lockout whenever a Vote Kick is passed from both Hardcore and Normal modes. While we realize this solution may allow players to exploit the Vote Kick function to avoid death, it's not a very reliable survival technique and we feel that it's a better alternative than players losing a character they've invested a lot of time into due to griefing. We'll definitely be keeping on an eye on this, though, and will consider other solutions if necessary.

I don't know yet if this is something that can be addressed via hotfix; it may be a fix that we need to implement with a client-side patch. We're still working out the details, and I'll provide an update once there's any more info to share.

PVP will never work in this game properly. As much as blizz wants it to work, this is mainly why itís taken them so long to get it working. The Mage and the Demon Hunter with their standoff attacks and Vaulting/Teleporting will make it nearly impossible for the other classes to catch them and beat them down. And anything that gets implemented will most likely be dumbed down classes to make it fair for all players.

PVP has no place in this game, the focus should have been on game play and story, but Blizz and their never ending quest for Greed canít leave well enough alone. In all seriousness, if you want PVP go play WOW. Itís basically the same two games now.